Não informado. (2000). University of Iowa studies in sociology, economics, politics and history. University of Iowa.
Lua i Stíl Chicago (17ú heag.)Não informado. University of Iowa Studies in Sociology, Economics, Politics and History. Iowa City, Iowa: University of Iowa, 2000.
Lua MLA (8ú heag.)Não informado. University of Iowa Studies in Sociology, Economics, Politics and History. University of Iowa, 2000.
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